Staircase obstacle assembly



FIG. 1 is a top front left perspective view of a staircase obstacle assembly showing my new design;

FIG. 2 is a top back right perspective view thereof;

FIG. 3 is a bottom front left perspective view thereof;

FIG. 4 is a bottom back right perspective view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevation view thereof;

FIG. 7 is a back elevation view thereof;

FIG. 8 is a bottom thereof;

FIG. 9 is a left side elevation view thereof; and,

FIG. 10 is a right side elevation view thereof.

The broken lines shown in the figures are for the purpose of illustrating portions of the staircase obstacle assembly and form no part of the claimed design. 

CLAIM What is claimed is the ornamental design for a staircase obstacle assembly, as shown and described. 